Create content programmatically

create_content.php

/**
 * Creates install content.
 *
 * @param array $content
 *   Content keyed by entity-type and UUID.
 *
 * @return array
 *   An array of entities created, keyed like the parameter.
 */
function _create_content(array $content) {
  $entities = [];
  foreach ($content as $entity_type_id => $items) {
    try {
      $storage = \Drupal::entityTypeManager()->getStorage($entity_type_id);
    }
    catch (Exception $e) {
      watchdog_exception('moodys_helper', $e, t("Entity type doesn't exist or storage handler couldn't be loaded."));
    }
    foreach ($items as $uuid => $item) {
      $entity = $storage->create($item + ['uuid' => $uuid]);
      try {
        $entity->save();
      }
      catch (Exception $e) {
        watchdog_exception('moodys_helper', $e, t("Error trying to create new content."));
        return $entities;
      }
      $entities[$entity_type_id][$entity->id()] = $entity;
    }
  }
  return $entities;
}